The ln8k15 can be replaced with the equivalent model 2SD2390. Because 2SD2390 and ln8k15 similar parameters include electrode capacitance, maximum drain current and device power. In addition, the 2SD2390 is also a PNP-type transistor, which is also suitable for ln8k15 replacement. If you need more advice on selection, you can consult the electronic component supplier or refer to the replacement manual and other relevant materials.